Electrode.



nium oxid.

other, since, in

ATENT OFFICE.

CHARLES Al ERNST, or SGHENECTADY,

COMPANY, A CORPORATION OF NEW YORK ELECTRODE.

No Drawing.

To all whom it may concern:

Be it known that I, CHARLES A. ERNST, a citizen of the United States, residing at Schenectady, in the county of Schenectady and State of New York, have invented certain new and useful Improvements in Electrodes, of which the following is a specification.

I have discovered that excellent results can be obtained by the use of the mineral franklinit'e as an ingredient in the composition of electrodes for are lighting.

Franklinite gives a steady flaming or luminous arc of good color and may be em ployed as the sole ingredient in electrodes. I prefer however to mix with the franklinite more or less of some material such as titanium oxid which gives a luminous arc of great brilliancy. In particular I have obtained excellent results with an electrode consisting of van iron tube or'sheath filled with a "powdere d mixture containing about 70 parts of franklinite and 30 parts of titafrequently used contains about 43 parts of iron, 17 parts of zinc and 12 parts of manganese, though. the exact composition of the franklinite does not seem to be important since more or less of one or the other of these constituents does notmaterially affect the utility of the electrode; nor is .it of any consequence whether or not these constituents found in fra 'nklinite. are chemically, combined with other elements or with each the electric are such chemical combinations become dissociated. The elec- .trode thus constructed is a good conductor of electricity at ordinaryiemperatures and gives a steady arc of great luminosity and of a good white color.

The proportion of franklinite and titanium oxid may be varied between quite wide isli'mits without materially afiecting the chari acter of the electrode.

Instead of inserting the franklinite and titanium oxid in an iron -sheath,'I may moisten the powdered mixture with a 'suitable binder to render it plastic,

Specification of Letters Patent. Application filed April 6, 1904. Serial No. 201,829.

The franklinite which I have 4 Patented Mar. 5, 1912.

and mold electrodes therefrom. In this case the electrodes are preferably heated somewhat after they are molded. In some cases I prefer to employ material, such as a chromium compound which will lessen the consumption of the electrode by the arc. Such material may be called a restraining material, or a restrainer. What I claim as new and desire to secure by Letters Patent of the United States, is,

1. An, are light electrode material consisting of a powdered mixture of franklinite, titanium oxid and a, rest-miner.

2. An are light electrode material consist-- ing of a powder containing a preponderating amount of a mixture of franklinite and titanium oxid. f

3.;An are light electrode material consisting of a powder containing a preponderating amount of franklinite.

4.. An are light electrode mixture containing seventy parts of franklinite and thirty parts of titanium oxid.

5. A composite arc-light electrode containing franklinite as a constituent.

6. A composite arc-light'electrode containing franklinite and titanium oxid as constituents. 7 A composite arc-light electrode containing, franklinite, titanium oxid and a restrainer as constituents.

8. A composite arc-light electrode containing iron, zinc and manganese as elementary constituents.

9. A composite arc-light electrode .containing iron, zinc, as elementary constituents.

10. A composite arc-light electrode containing iron, zinc, manganese, titanium and a restrainer as elementary constituents.

In witness whereof, I have hereunto my hand this 5th day of April, 190$.

CHARLES ERNST.

set

manganese and titanium with the franklinite some 

